Abstract The mechanical properties of geosynthetic reinforcements are known to be time-, environment- and stress-dependent. Characterization of these reinforcement properties is often assessed under controlled laboratory settings and extrapolated to the design life of geosynthetic-reinforced soil structures. However, despite the wide application of geosynthetic reinforcement in earth retaining structures, there is limited evaluation of how mechanical properties of geosynthetic materials change in situ on constructed works; and primarily limited to case studies within the first decade following construction. This study describes the change in mechanical properties of geogrids retrieved from the facing of the wrapped-face of one of the oldest geosynthetic-reinforced mechanically-stabilized earth (MSE) walls in the United States, constructed in 1983 in a relatively harsh, coastal environment. Laboratory characterization of mechanical and chemical properties of the geogrid are presented, and compared to properties of archived samples, as well as samples from another structure exhumed 8 and 11 years after its respective construction. The laboratory test results demonstrate that the geogrid mechanical and chemical properties have not significantly changed in the 35+ years of service. While the data from this study represents a limited set of conditions, these results demonstrate that geogrids may perform well long after construction.

中文翻译：

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36 年机械稳定土墙土工格栅力学和化学特性的表征

摘要 土工合成材料增强材料的力学性能与时间、环境和应力有关。这些加固特性的表征通常在受控实验室环境下进行评估，并推断到土工合成材料加固土壤结构的设计寿命。然而，尽管土工合成材料在挡土结构中得到了广泛的应用，但对土工合成材料的力学性能如何在建筑工程中原位变化的评估有限；并且主要限于建设后第一个十年内的案例研究。这项研究描述了从美国最古老的土工合成材料增强机械稳定土 (MSE) 墙之一的包裹面的饰面中提取的土工格栅的力学性能变化，于 1983 年在相对恶劣的沿海环境中建造。介绍了土工格栅的机械和化学特性的实验室表征，并与存档样品的特性以及在其各自建造 8 年和 11 年后挖掘出的另一个结构的样品的特性进行了比较。实验室测试结果表明，土工格栅的机械和化学性能在 35 多年的使用中没有显着变化。虽然这项研究的数据代表了一组有限的条件，但这些结果表明土工格栅在施工后很长一段时间内可能表现良好。以及在其各自建造后 8 年和 11 年挖掘出的另一个结构的样本。实验室测试结果表明，土工格栅的机械和化学性能在 35 多年的使用中没有显着变化。虽然这项研究的数据代表了一组有限的条件，但这些结果表明土工格栅在施工后很长一段时间内可能表现良好。以及在其各自建造后 8 年和 11 年挖掘出的另一个结构的样本。实验室测试结果表明，土工格栅的机械和化学性能在 35 多年的使用中没有显着变化。虽然这项研究的数据代表了一组有限的条件，但这些结果表明土工格栅在施工后很长一段时间内可能表现良好。